options for sealing shafts against water entry
options for sealing shafts against water entry
(OP)
I am looking at TEFC wound rotor induction motors from 5hp-100hp used in outdoor crane applications. We have a high incidence of water entering the bearings and causing problems.
Is there any field-retrofittable method to improve the degree of protection against moisture ingress? (slinger ring? lip seal? forsheda ring etc).
What about shop-retrofittable options?
Have you had good experience with simple flexible slinger rings?
Is there any field-retrofittable method to improve the degree of protection against moisture ingress? (slinger ring? lip seal? forsheda ring etc).
What about shop-retrofittable options?
Have you had good experience with simple flexible slinger rings?





RE: options for sealing shafts against water entry
Next make sure you have heaters in all of them. Wire the heaters through a "B" starter contact. If you have motors positioned where water collect around the shaft turning off a hot motor will suck water right in.
If water is still a problem and you have air available pressurize each motor. Use a good requlator and put something like a 1/2- 2" " of water pressure on the motor. To much and you can push the existing seals and greas out.
I have seen the air thing used in a washdown enviroment and it worked. The motor manufacture didn't want to know anything about it.
Hope that gives you a few ideals
RE: options for sealing shafts against water entry
Long shot: http://www.motortronics.com/products/otpr.html
RE: options for sealing shafts against water entry
When our shop rewinds and rebuilds a wash down immersion duty motor. 1. We rewind with immersion class H winding
materials and a special winding process and use cc1118lv VPI. 2. Use sealed bearings (2rs) 3. Use Impro seals on load end and opp-load end. 4. Silicone all mating surfaces. 5. chico (cement) Junction box lead entrance on stator.
Kind Regards,
motorhead
RE: options for sealing shafts against water entry
http://www.inpro-seal.com/
RE: options for sealing shafts against water entry
http://www.geindustrial.com.br/publicacoes/manuals/geep160.pdf
http://www.tatung.com/heavy/motor/ACMOTOR/buyer%20guide.pdf
(IEC Frame size 142-400 for crane motors)
etc. for more info
RE: options for sealing shafts against water entry
hope this will help
kind regds.
RE: options for sealing shafts against water entry
I think the Inpro seal will be too expensive to retrofit. We've got several large cranes and I'm thinking around 50 motors involved.
Some of the other flinger rings I have seen used on transformer fan motors didn't seem to work well although we don't inspect them like TECO recommends.
The two recent failures that I was involved in were bearing failures. I've been told there were many previous failures but I wasn't involved.
From all your comments I'm thinking a good approach would be to add a cheap seal and go to sealed bearings. Since this is a very intermittent duty motor it seems like a perfect candidate for sealed bearings (sealed grease should last a long time). I guess I'll have to look closely at the bearing bores and speeds to make sure that won't cause overheating problems.
What do you guys think? Any other comments?
RE: options for sealing shafts against water entry